http://lun-deux.fr/wp-captcha.php Recommended/popular LaTeX packages.

rencontre libertine à le havre 1. 9 Essential packages.
http://www.howtotex.com/packages/9-essential-latex-packages-everyone-should-use/

2. 10+ packages.
http://blog.analogmachine.org/2011/05/16/top-10-latex-packages/

3. Discussion in TeX StackExchange forum.
http://tex.stackexchange.com/questions/553/what-packages-do-people-load-by-default-in-latex